
HD Audio SoundMAX
Codec
AD1981HD
FEATURES
2 DAC channels: 16-, 20-, or 24-bit
2 ADC channels: 16- or 20-bit
HD audio sample rates
8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz,
44.1 kHz, 48 kHz
Greater than 90 dB dynamic range
S/PDIF output: 32 kHz, 44.1 kHz or 48 kHz, 16- or 24-bit
Digital beep and analog PC beep pass-through
Integrated headphone amplifiers on two ports
Port retasking
Selectable microphone and line inputs
Full analog mixer
Legacy inputs: CD and auxiliary inputs
External amplifier power-down (EAPD)
48-pin, Pb-free LQFP
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2005 Analog Devices, Inc. All rights reserved.
www.analog.com
ENHANCED FEATURES
No AFILT pins, results in BOM savings
5.0 V AV
DD
supply, 3.3 V DV
DD
supply
Jack-sensing autoconfiguration options
Mute line output and monaural output (MONO_OUT)
when headphones are used
Mute MONO_OUT when a device is in the line out jack
Selectable trip level: high/low supports all jack types
Peripheral identification/enumeration
Jack event/presence detection using SENSE or GPIO pins
Microphone to MONO_OUT for speakerphone applications
Advanced power management modes
4 software-controlled microphone bias pins
Up to 30 dB microphone boost
4 GPIOs—external control or traditional jack sense
FUNCTIONAL BLOCK DIAGRAM
0
EQ
PCM
Σ
-
Δ
DAC
S/PDIF_OUT
H
GPIO
GPIO
JACK
SENSE
SENSE
DIGITAL
PC BEEP
Σ
GA
G
PC BEEP
S
GA
GA
GA
GA
GA
GA
PC BEEP
PCM/FLOAT32
Σ
-
Δ
ADC
S
M
G
PCM/AC3
S/PDIF TX
S
S
GAM
GAM
HP
S
GAM
BOOST
BOOST
MIC
HP
Z
Z
S
GAM
MIC
Z
Z
S
BOOST
GAM
MIC
Z
Z
S
BOOST
MIC
Z
C
C
C
DIFF
AMP
P
A
Σ
M
M
MIC_BIAS-C
PORT-C
LINE_IN
MONO_OUT
PORT-A
HEADPHONE
MIC_BIAS-F
PORT-F
REAR MIC
MIC_BIAS-D
PORT-D
LINE_OUT
MIC_BIAS-B
PORT-B
FRONT MIC
RESET
AV
DD
AV
SS
PC BEEP
5V
M
M
M
M
M
M
M
M
Figure 1.